Manager reached out to me via email from LinkedIn. Gave me a choice between on-site screen and phone screen. Went on-site, guy was super friendly. Asked unusual behavioural questions but was a refreshing change. Asked a very easy coding question then a very difficult one. The guy didn't know C++ and had never seen his question solved the way I did it so couldn't really determine if my solution was correct or not. Moved onto on-site loop a few weeks later. Only had 3 interviews planned, but a 4th was added part way through the day with the hiring manager (as app). The questions were all reasonably simple with difficult constraints added before coding. LeetCode medium/hard level for sure. The recruiter reached out with an offer the next day. I was able to negotiate well because I had a competing offer.